Vijay Singh sued the PGA Tour on Wednesday for exposing him to "public humiliation and ridicule" during a 12-week investigation into his use of deer antler spray that ended last week when the tour dropped its case against him.

The lawsuit was a surprise, and so was the timing -- the day before The Players Championship, the flagship event on the tour held on its home course where Singh has honed his game for the last two decades.

"I am proud of my achievement, my work ethic and the way I live my life," Singh said in a statement. "The PGA Tour not only treated me unfairly, but displayed a lack of professionalism that should concern every professional golfer and fan of the game."

Singh filed the lawsuit in New York, where he has a home and the tour has an office. He is in the field at The Players Championship at TPC Sawgrass in Ponte Vedra Beach, Fla.

The 50-year-old Fijian, inducted into the World Golf Hall of Fame in 2006, said in a Sports Illustrated article in January that he used deer antler spray, and he was "looking forward to some change in my body." The spray was said to include an insulinlike growth factor that was on the tour's list of banned substances. The tour sent a sample from Singh to be tested, and it returned small amounts of IGF-1.

Tour commissioner Tim Finchem announced April 30 that the tour was dropping its case because of new information from the World Anti-Doping Agency, which said deer antler spray was no longer considered prohibited because it contained just minimal amounts of the growth factor.

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The lawsuit claims the tour relied on WADA's list of banned substances and methods without doing any of its own research, including whether such substances even provide any performance-enhancing benefits. Singh's lawyers said the tour "rushed to judgment and accused one of the world's hardest working and most dedicated golfers of violating the rules of the game."

"We have not seen the lawsuit, just the statement," tour spokesman Ty Votaw said. "We have no comment."

"He's looking to reclaim his reputation and hold the tour accountable for acting irresponsible," said Jeffrey Rosenblum, one of Singh's lawyers.

Rosenblum also represented Doug Barron, the only player suspended under the tour's anti-doping policy. Barron sued the tour, and the case was settled. Rosenblum could not comment on the settlement, which was confidential.

One night after making his red carpet debut in New York, Tiger Woods was on a golf course that hasn't treated him very well over the years. Woods said it took him a week to get over his tie for fourth at the Masters. Next up is The Players Championship, where he has won only once in 15 years and has just one top 10 since that victory in 2001.

"If you're not playing well, you're going to get exposed," he said.

Woods was at full exposure Monday night at the Met with girlfriend Lindsey Vonn. For someone who has demanded so much privacy off the golf course, he attended the Costume Institute Gala. Vonn was a guest of Vogue. He wore a black suit, while the Olympic ski champion wore a long white dress with see-through slits.

"Lindsey wanted to grow her brand," Woods said. "She's come out with a new perfume and makeup line, so that was a big thing for her, and I'm supporting it."

Jacksonville Jaguars running back Maurice Jones-Drew, who's recovering from Lisfranc surgery on his left foot, picked up an 8-iron Wednesday and hit a tee shot to 10 feet at the famed 17th-hole island green at TPC Sawgrass. "I dabble a little bit in golf here and there," the former De La Salle High-Concord star said.

Oregon coach and former Stanford star Casey Martin shot 69 at Portland Golf Club to advance to sectional qualifying for the U.S. Open.